I had two very odd encounters in Anvil.
1. I sleeped at Counts Arms(Or what the Inn was called) and Dark Brotherhood assassin attacked me, the one from Morrowind. I have never been in Morrowind in that character.
2. I was a Criminal Scum and guard arrested me and i paid my fine, After paying my fine i was in Anvil Castle courtyard and i met quite odd NPC there, the Skaal Honor Guard from Solstheim.
So there is my bug report. I would really like to know what caused those NPC to spawn in Anvil.

#1
Well the assasin is from Tribunal and his job is to kill you. But in Morrowind there was nowhere else to go but Vardenfell and Soltheim. I think his movement needs to be restricted to the cells in Morrowind.